216303 has 4 divisors (see below), whose sum is σ = 288408. Its totient is φ = 144200.

The previous prime is 216289. The next prime is 216317. The reversal of 216303 is 303612.

216303 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216289) and next prime (216317).

It is a cyclic number.

It is not a de Polignac number, because 216303 - 2¹⁰ = 215279 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

216303 is strictly pandigital in base 7.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36048 + ... + 36053.

It is an arithmetic number, because the mean of its divisors is an integer number (72102).

2²¹⁶³⁰³ is an apocalyptic number.

216303 is a deficient number, since it is larger than the sum of its proper divisors (72105).

216303 is an equidigital number, since it uses as much as digits as its factorization.

216303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72104.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 216303 is about 465.0838634053. The cubic root of 216303 is about 60.0280424472.

Adding to 216303 its reverse (303612), we get a palindrome (519915).

The spelling of 216303 in words is "two hundred sixteen thousand, three hundred three".